The HD600/4's power 16 6.5" coaxials (4 in the grille, 4 in each door panel & 2 in each rear side panel) all housed in custom built enclosures. Each HD750/1 powers a 13W7 in a ported, LED lit, mirrored acrylic enclosure. A 250 amp alternator, dual batteries & 0 gauge wiring powers everything while 2 HD-RLC's allow for fine tuning.